class_docstr: Base class for all other trainer classes.
  
  :param boolean show_training_progress: Show progress indicators for the
         trainer. The environment variable ``CHATTERBOT_SHOW_TRAINING_PROGRESS``
         can also be set to control this. ``show_training_progress`` will override
         the environment variable if it is set.
code: def _generate_export_data(self):
      result = []
      for statement in self.chatbot.storage.filter():
          if statement.in_response_to:
              result.append([statement.in_response_to, statement.text])
  
      return result
  
imports: import os
  import sys
  import csv
  import time
  from dateutil import parser
  from chatterbot.conversation import Statement
  from chatterbot.tagging import PosLemmaTagger
  from chatterbot import utils
label_desc: Use image node_id 4 for calling the Trainer obj's underlying member method code with example usage: obj._generate_export_data() and returns: result